I understand and agree with your point that you can't just "buy" cybersecurity by throwing money at the problem. It's more like building a well-defended castle, where multiple elements work together to create true security. Cybersecurity is a company-wide process that needs to be powered by specialized tools.

The fact that one of the fastest-growing markets is omitted by YC is shocking to me. The opportunity to build $1B companies, which seems to be one of YC's acceptance criteria, is enormous.

I don't know how far or close you are to the security field, but I do share your sentiment that many tools and so-called security solutions are useless and don't solve the problem. So it's now even more necessary to go and build new solutions. The problem persists and grows.